/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package cn.dengta.context.rpc;

import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Type;

import com.alibaba.fastjson2.JSONB;
import com.alibaba.fastjson2.JSONReader;
import org.apache.dubbo.common.serialize.ObjectInput;
import org.apache.dubbo.common.serialize.fastjson2.Fastjson2CreatorManager;
import org.apache.dubbo.common.serialize.fastjson2.Fastjson2SecurityManager;
import org.apache.dubbo.common.utils.ClassUtils;

/**
 * FastJson object input implementation
 */
public class FastJson2ObjectInput implements ObjectInput {

	private final Fastjson2CreatorManager fastjson2CreatorManager;

	private final Fastjson2SecurityManager fastjson2SecurityManager;

	private volatile ClassLoader classLoader;
	private final InputStream is;

	public FastJson2ObjectInput(Fastjson2CreatorManager fastjson2CreatorManager,
	                            Fastjson2SecurityManager fastjson2SecurityManager, InputStream in) {
		this.fastjson2CreatorManager = fastjson2CreatorManager;
		this.fastjson2SecurityManager = fastjson2SecurityManager;
		this.classLoader = Thread.currentThread().getContextClassLoader();
		this.is = in;
		fastjson2CreatorManager.setCreator(classLoader);
	}

	@Override
	public boolean readBool() throws IOException {
		return readObject(boolean.class);
	}

	@Override
	public byte readByte() throws IOException {
		return readObject(byte.class);
	}

	@Override
	public short readShort() throws IOException {
		return readObject(short.class);
	}

	@Override
	public int readInt() throws IOException {
		return readObject(int.class);
	}

	@Override
	public long readLong() throws IOException {
		return readObject(long.class);
	}

	@Override
	public float readFloat() throws IOException {
		return readObject(float.class);
	}

	@Override
	public double readDouble() throws IOException {
		return readObject(double.class);
	}

	@Override
	public String readUTF() throws IOException {
		return readObject(String.class);
	}

	@Override
	public byte[] readBytes() throws IOException {
		int length = is.read();
		byte[] bytes = new byte[length];
		int read = is.read(bytes, 0, length);
		if (read != length) {
			throw new IllegalArgumentException("deserialize failed. expected read length: " + length + " but actual read: " + read);
		}
		return bytes;
	}

	@Override
	public Object readObject() throws IOException, ClassNotFoundException {
		return readObject(Object.class);
	}

	@Override
	public <T> T readObject(Class<T> cls) throws IOException {
		updateClassLoaderIfNeed();
		int length = readLength();
		byte[] bytes = new byte[length];
		int read = is.read(bytes, 0, length);
		if (read != length) {
			throw new IllegalArgumentException("deserialize failed. expected read length: " + length + " but actual read: " + read);
		}
		Fastjson2SecurityManager.Handler securityFilter = fastjson2SecurityManager.getSecurityFilter();
		T result;
		if (securityFilter.isCheckSerializable()) {
			result = JSONB.parseObject(bytes, cls, securityFilter,
					JSONReader.Feature.UseDefaultConstructorAsPossible,
					JSONReader.Feature.ErrorOnNoneSerializable,
					JSONReader.Feature.IgnoreAutoTypeNotMatch,
					JSONReader.Feature.UseNativeObject,
					JSONReader.Feature.FieldBased);
		} else {
			result = JSONB.parseObject(bytes, cls, securityFilter,
					JSONReader.Feature.UseDefaultConstructorAsPossible,
					JSONReader.Feature.UseNativeObject,
					JSONReader.Feature.IgnoreAutoTypeNotMatch,
					JSONReader.Feature.FieldBased);
		}
		if (result != null && cls != null && !ClassUtils.isMatch(result.getClass(), cls)) {
			throw new IllegalArgumentException("deserialize failed. expected class: " + cls + " but actual class: " + result.getClass());
		}
		return result;
	}

	@Override
	public <T> T readObject(Class<T> cls, Type type) throws IOException, ClassNotFoundException {
		return readObject(cls);
	}

	private void updateClassLoaderIfNeed() {
		ClassLoader currentClassLoader = Thread.currentThread().getContextClassLoader();
		if (currentClassLoader != classLoader) {
			fastjson2CreatorManager.setCreator(currentClassLoader);
			classLoader = currentClassLoader;
		}
	}

	private int readLength() throws IOException {
		byte[] bytes = new byte[Integer.BYTES];
		int read = is.read(bytes, 0, Integer.BYTES);
		if (read != Integer.BYTES) {
			throw new IllegalArgumentException("deserialize failed. expected read length: " + Integer.BYTES + " but actual read: " + read);
		}
		int value = 0;
		for (byte b : bytes) {
			value = (value << 8) + (b & 0xFF);
		}
		return value;
	}

}
